Exedrobatrachus Richards, Mahony & Donnellan, 2025

Exedrobatrachus Richards, Mahony & Donnellan , gen. nov.

( Fig. 16)

ZooBank LSID: urn:lsid:zoobank.org:act: Type species: Litoria biakensis Günther, 2006 .

Content: One species— Exedrobatrachus biakensis * (Günther, 2006) comb. nov.

Diagnosis: Exedrobatrachus can be diagnosed from Papuahyla by tubercules on the hindlimb vs. an unornamented hindlimb, by a fusiform vs. right triangular call envelope shape, and 13 sites in the mitochondrial ND4 alignment ( Table 3). Exedrobatrachus can be diagnosed from Exochohyla by the absence vs. presence of a rostral spike, the occurrence of small pigmented vs. large unpigmented ova; and from each species of Ischnohyla by species specific combination of each of the four following characters: by small vs. medium ( I. nigropunctata and I. umarensis ) or large ( I. daraiensis and I. gracilis ) eggs; pigmented vs. unpigmented ( I.gracilis ) eggs; absence vs. presence ( I. gracilis and I. nigropunctata ) of the vomerine teeth; toe discs smaller than finger disc vs. equal ( I. gracilis , I. nigropunctata , I. umarensis , and I. vocivincens ). Refer to Tables 1 and 2.

Distribution and ecology: Arboreal frogs that are found in swamps with thickets of trees and brush on Biak Island, Papua Province, Indonesia ( Günther 2006b).

Etymology: From the Greek ἔξεΔΡος ( exedros, away from home) and βάτΡαΧος ( batrachos, frog). Both the original batrachos and the Latinized batrachus are masculine (Article 30.1.3). The name alludes to the biogeographically and phylogenetically isolated nature of the lineage.

Remarks: A monotypic genus with a distribution confined to Biak Island, a continental island which harbours a number of endemic vertebrates ( Bergmans and Sarbini 1985, Groves and Flannery 1994, Jacobs 2002).